#!/bin/python

import sys


n = int(raw_input().strip())
a = map(int, raw_input().strip().split(' '))
# your code goes here

a.sort()

diff = float('inf')

for i in range(len(a)-1):
    d = a[i+1] - a[i]
    if d < diff:
        diff = d
        if diff == 0:
            break

print diff